/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

package com.edvard.poseestimation

import android.content.Context
import android.util.AttributeSet
import android.view.TextureView
import android.view.View

/** A [TextureView] that can be adjusted to a specified aspect ratio.  */
class AutoFitTextureView @JvmOverloads constructor(
  context: Context,
  attrs: AttributeSet? = null,
  defStyle: Int = 0
) : TextureView(context, attrs, defStyle) {

  private var mRatioWidth = 0
  private var mRatioHeight = 0

  /**
   * Sets the aspect ratio for this view. The size of the view will be measured based on the ratio
   * calculated from the parameters. Note that the actual sizes of parameters don't matter, that is,
   * calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result.
   *
   * @param width Relative horizontal size
   * @param height Relative vertical size
   */
  fun setAspectRatio(
    width: Int,
    height: Int
  ) {
    if (width < 0 || height < 0) {
      throw IllegalArgumentException("Size cannot be negative.")
    }
    mRatioWidth = width
    mRatioHeight = height
    requestLayout()
  }

  override fun onMeasure(
    widthMeasureSpec: Int,
    heightMeasureSpec: Int
  ) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec)
    val width = View.MeasureSpec.getSize(widthMeasureSpec)
    val height = View.MeasureSpec.getSize(heightMeasureSpec)
    if (0 == mRatioWidth || 0 == mRatioHeight) {
      setMeasuredDimension(width, height)
    } else {
      if (width < height * mRatioWidth / mRatioHeight) {
        setMeasuredDimension(width, width * mRatioHeight / mRatioWidth)
      } else {
        setMeasuredDimension(height * mRatioWidth / mRatioHeight, height)
      }
    }
  }
}
